<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

    <input type="text">



    <script src="../js/reg.js"></script>
    <script>

        // 

        // 输入框的值
        // 正则校验


        const oInp = document.querySelector('input');
        oInp.onblur = function () {
            const username = this.value;
            if (userFn(username)) {
                alert('ok')
            }
            else {
                alert('err')
            }
        }








        // function regTest(reg, str) {
        //     return reg.test(str)
        // }



    </script>

</body>

</html>